The Leica I C

The Leica I C camera, non standardized, was the first production Leica to accept interchangeable lenses, although lenses were adjusted to individual cameras as the lens mount flange to film distance varied on each camera. The lens mount is not engraved but the lenses which are matched to a particular body are engraved with the last three digits of the camera body serial number.
The shutter release was the same as the late type A mode, being threaded to accept a cable release
The camera is similar in all other aspects to the model A, except that the angled infinity lock is no longer fitted.

The production period  begin in  1930 with serial number  37280 and ended in 1931 with serial number 55401 for a total of 2995 cameras.

The Leica I C camera, standardized, was basically identical to the previous Leica I with the exception that for the first time lenses could be interchanged and was not necessary to match them to in individual camera body.
The production period  begin in  1931 and ended in 1933, for a total of 7231 cameras.
All the cameras were in black paint finish.

Codeword was LENEU.

For illustration a Leica I C, from 1930, with Elmar 3.5/50, nickel, 11 o’clock , no s/n,  Elmar 4.5/135 no s/n , engraved with the last 3 digit from the camera and  Elmar 3.5/35; in the back the camera leather bag and the original container with two rooms for the 135 & the 35 lenses.

Accessories accompanying are, the HEBOO slow speed attachment with box & instructions for use leaflet, an AUFSU  waist level viewfinder, a container for the FILCA cassette and a catalog from 1930 opened at the referenced page.

Hugo Meyer from Germany marketed this reflex viewfinder coupled to the lens named "megoflex", a must in that time.